<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>数据代理</title>
    <!--导入js package-->
    <script type="text/javascript" src="../01-vue_js/vue.js"></script>
</head>
<body>

<script type="text/javascript">
    let obj1 = {x: 100}
    let obj2 = {y: 200}

    Object.defineProperty(obj2, 'x', {
        get() {
            return obj1.x
        },
        set(value) {
            obj1.x = value
        }
    })
</script>

</body>
</html>